Determine the reactions and draw the shear and bending moment diagrams for the structures shown in Figs. P13.37–P13.45 using the method of consistent deformations
Consider the beam;
Compute the degrees of indeterminacy:
Total number of reactions of the given beam is, but we have only three equilibrium equations,
Therefore degree of indeterminacy of the beam is given by
Primary beam:
Obtained by removing the hinged support A from the given indeterminate beam
Primary beam subjected to external loading
Here, denotes the horizontal deflection and denotes the vertical deflection at A due to external loading
Therefore from virtual work method,
And
Primary beam subjected to unit value of the redundant
Here, anddenotes the deflection at AX and AY due to unit value of the redundant
Therefore, from virtual work method
And
Primary beam subjected to unit value of the redundant
Here, anddenotes the deflection at AY and AX due to unit value of the redundant
Therefore from virtual work, we get
And
Compatibility equation:
The compatibility equation can be expressed as
By substituting the obtained values into the compatibility equation (1) and (2),determine the redundantand
Solve the equations (1) and (2).
Draw the free body diagram of the frame:
Compute the reactions of the beam:
Apply equilibrium equations:
Therefore, the horizontal reaction at E is .
Compute the vertical reaction at E.
Therefore, the vertical reaction at E is .
Compute the bending moment at E.
Therefore, the bending moment at E is .
Draw the bending moment diagrams.